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3 years ago

Given an initial polynomial of x^2 + 2x, which polynomial needs to be added to it

Mathematics

1 answer:

Flauer [41]3 years ago

4 0

Answer:

I wish i was in high school but 2 more years left for me so sorry i cant help :(

Step-by-step explanation:

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A Gallup Poll showed that 30% of Americans are satisfied with the way things are going in the United States. Suppose a sample of

mars1129 [50]

The expected number of a distribution is its mean.

The expected number of Americans who are satisfied with the way things are going in the United States is 6
The standard deviation of Americans who are satisfied with the way things are going in the United States is 2.05

The given parameters are:

$\mathbf{p = 30\%}$ --- the proportion that are satisfied

$\mathbf{n = 20}$ --- the sample size

(a) The expected number that are satisfied

This is calculated using:

$\mathbf{E(x) = np}$

So, we have:

$\mathbf{E(x) = 20 \times 30\%}$

$\mathbf{E(x) = 6}$

The expected number of Americans who are satisfied with the way things are going in the United States is 6

(b) The standard deviation of those that are satisfied

This is calculated using:

$\mathbf{\sigma = \sqrt{n \times p \times (1 - p)}}$

So, we have:

$\mathbf{\sigma = \sqrt{20 \times 30\% \times (1 - 30\%)}}$

$\mathbf{\sigma = \sqrt{20 \times 30\% \times 70\%}}$

$\mathbf{\sigma = \sqrt{4.2}}$

$\mathbf{\sigma = 2.05}$

The standard deviation of Americans who are satisfied with the way things are going in the United States is 2.05

Read more about expected value and standard deviations at:

brainly.com/question/17088771

4 0

3 years ago

How do you convert fractions into decimals

mixer [17]

Let's say we have the fraction $\frac{1}{2}$

For instance, in the case of the fraction: " 1/2" ; the denominator is ' " 2 " . If the denominator is 2, we must divide 2 by our numerator which is 1 so we will create a divison problem and it will be 1 ÷ 2 = 0.5

↑ This method will always work ↑

3 0

3 years ago

Read 2 more answers

What’s the volume of the cylinder i need help please !!!

Sindrei [870]

Answer:

V= π ⋅ 4y^2 ⋅ 9x

Step-by-step explanation:

Put the variables from the picture into the equation

r=4y

h=9x

(^2 means squared)

7 0

3 years ago

Given the range {2, 3, 9}, what is the domain for the relation y = x + 3?

balandron [24]

A function is a relation (so, it is the set of ordered pairs) that does not contain two. The domain is the set X= {1,2,3,4} and the range is the subset {a,b,c} of Y.

6 0

3 years ago

A geologist examines 6 seawater samples for lead concentration. The mean lead concentration for the sample data is 0.903 cc/cubi

Gnesinka [82]

Answer:

Step-by-step explanation:

We want to determine a 95% confidence interval for the mean lead concentration of sea water samples

Number of samples. n = 6

Mean, u = 0.903 cc/cubic meter

Standard deviation, s = 0.0566

For a confidence level of 95%, the corresponding z value is 1.96. This is determined from the normal distribution table.

We will apply the formula

Confidence interval

= mean +/- z ×standard deviation/√n

It becomes

0.903 +/- 1.96 × 0.0566/√6

= 0.903 +/- 1.96 × 0.0566/2.44948974278

= 0.903 +/- 0.045

The lower end of the confidence interval is 0.903 - 0.045 =0.858

The upper end of the confidence interval is 0.903 + 0.045 =0.948

Therefore, with 95% confidence interval, the mean lead concentration of the sea water is between 0.858 cc/cubic meter and 0.948 cc/cubic meter

7 0

3 years ago